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Marketable Securities - Continuous Unrealized Loss Position (Details) $ in Thousands | Dec. 31, 2019 USD ($)
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Debt Securities, Available-for-sale [Line Items] |
Fair Value | $ 216,797
Gross Unrealized Losses | (85)
Corporate debt securities |
Debt Securities, Available-for-sale [Line Items] |
Fair Value | 88,354
Gross Unrealized Losses | (32)
Municipal securities |
Debt Securities, Available-for-sale [Line Items] |
Fair Value | 3,671
Gross Unrealized Losses | (3)
U.S. Government agency securities |
Debt Securities, Available-for-sale [Line Items] |
Fair Value | 37,246
Gross Unrealized Losses | (13)
U.S. Treasury securities |
Debt Securities, Available-for-sale [Line Items] |
Fair Value | 87,526
Gross Unrealized Losses | $ (37)

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- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=118955579&loc=SL82922888-210455 + Details
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